hi
can someone tell me what the diffrence is
between a 10mm 12mm and a QR rear hub
as i am going to buy a new hub and wondered which one to buy out of them
cheers steve
the one that fits your frame....
quick release is a quick release.
10mm and 12 mm are *probably* bolt thru. look like this.
[img] 
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with a big threaded axle.
HTH
QR=9mm axle diameter. 10 and 12mm are generally bolt through sizes. 10mm was for early bolt through rear ends I can't think if anything new that still uses that size. 12mm comes in 135 (standard hub width in mm) and 150 (for dh/freeride bikes generally) widths. 150 rear end generally use an axle threaded at one end with an allen key socket in the other, I can't recall seeing any quite as agricultural as the one in the pic above!
From memory rear maxle is 135 x 12mm.
What bike do you have/what current wheel fixni system (QR, threaded axle etc)?
Std. Rear QR is 10mm (not 9mm as stated above, std. front QR is 9mm) With a std. rear 135mm dropout, you can either run a QR or 10mm bolt-up/bolt through axle. For 12mm axle you would need a specific frame/swingarm to run it.
i am building an intense uzzi dh
and it did have a QR wheel on it
but i was wondering what would be best on there for downhill riding
[img]C:\Users\Public\Pictures[/img]
It's frame rather than like dependent I'm afraid. 150 x 12mm bolt through gives you the stiffest back end and wheel so is generally thought of as best for DH.
If you've got a QR frame already then a standard hub with bolt up rather than QR axle will be your best.
this is the swing arm
[IMG] 
[/IMG]
go for a 10mm bolt through, hope pro 2 comes in this option!..... job done